409 AL (Aluminized) Stainless Steel
Includes Type 1 hot dip aluminum coating provides extended life and additional resistance to automotive muffler condensation and road salt. Type 409 Aluminized Stainless Steel is a ferritic stainless steel enhanced with a Type 1 hot-dip aluminum coating (approximately 91% aluminum and 9% silicon). This unique combination provides superior resistance to corrosion and oxidation, making it an ideal choice for demanding environments such as automotive exhaust systems, industrial components, and more. The aluminum coating is metallurgically bonded to the 409 stainless steel substrates, ensuring extended durability and performance under high temperatures and corrosive conditions.
Originally developed for automotive exhausts, Type 409 Aluminized Stainless Steel has expanded into various industries due to its excellent formability, weldability, and cost-effectiveness. It offers a practical solution for applications requiring robust performance without the premium cost of higher-grade stainless steels.
Type 409 Aluminized Stainless Steel is widely used across various industries due to its robust properties. Common applications include:
- Automotive Exhaust Systems: Mufflers, catalytic converters, manifolds, and exhaust tubing.
- Industrial Components: Heat exchangers, silencers, and fuel filters.
- Agricultural Equipment: Spreaders and other machinery exposed to harsh environments.
- HVAC Systems: Components requiring corrosion resistance and moderate heat tolerance.
- Appliances: Parts needing durability and a smooth finish in moderate conditions.
Type 409 Aluminized Stainless Steel combines the properties of ferritic stainless steel with an aluminum-silicon coating. Key specifications include:
| Property | Value |
|---|---|
| Base Material | Type 409 Ferritic Stainless Steel (UNS S40900) |
| Chemical Composition (Base) | Fe, <0.08% C, 10.5-11.75% Cr, <0.5% Ni, <1.0% Mn, <1.0% Si, 6x%C-0.75% Ti |
| Coating Composition | Type 1 Hot-Dip Aluminum (91% Al, 9% Si) |
| Corrosion Resistance | Superior to coated carbon steel and Type 410; less than Type 304/304L |
| Temperature Resistance | Red rust protection to 800°F (427°C); oxidation resistance to 1550°F (843°C) |
| Standards | ASTM A240, ASME SA240 |